Browsing by Subject "Compressibility"

Now showing items 1-20 of 21

    • Article  

      Combined effects of compressibility and slip in flows of a Herschel-Bulkley fluid 

      Damianou, Y.; Georgiou, Georgios C.; Moulitsas, I. (2013)
      In this work, the combined effects of compressibility and slip in Poiseuille flows of Herschel-Bulkley fluids are investigated. The density is assumed to obey a linear equation of state, and wall slip is assumed to follow ...
    • Article  

      Laminar axisymmetric flow of a weakly compressible viscoelastic fluid 

      Housiadas, Kostas D.; Georgiou, Georgios C.; Mamoutos, Ioannis G. (2012)
      The combined effects of weak compressibility and viscoelasticity in steady, isothermal, laminar axisymmetric Poiseuille flow are investigated. Viscoelasticity is taken into account by employing the Oldroyd-B constitutive ...
    • Article  

      New analytical solutions for weakly compressible Newtonian Poiseuille flows with pressure-dependent viscosity 

      Housiadas, Kostas D.; Georgiou, Georgios C. (2016)
      Steady-state, isothermal, Poiseuille flows in straight channels and circular tubes of weakly compressible Newtonian fluids are considered. The major assumption is that both the mass density and the shear viscosity of the ...
    • Conference Object  

      Numerical simulation of injection mold filling for semi-solid materials 

      Ahmed, Alauddin; Alexandrou, Andreas N. (ASME, 1995)
      Processing of metals and metal matrix composites in the semi-solid state is an emerging new technology and is becoming increasingly popular. This method provides several advantages over the traditional liquid state processing ...
    • Article  

      Numerical simulation of the extrusion of strongly compressible Newtonian liquids 

      Taliadorou, Eleni G.; Georgiou, Georgios C.; Mitsoulis, Evan C. (2008)
      The axisymmetric and plane extrusion flows of a liquid foam are simulated assuming that the foam is a homogeneous compressible Newtonian fluid that slips along the walls. Compressibility effects are investigated using both ...
    • Doctoral Thesis  Open Access

      Numerical simulations of compressible generalized newtonian flows 

      Taliadorou, Eleni G. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2009-01)
      Στη παρούσα διατριβή μελετήσαμε με αριθμητικές μεθόδους και μεθόδους διαταραχών ς συμπιεστές Νευτώνειες και γενικευμένες Νευτώνειες ροές. Αρχικά, μελετήσαμε αριθμητικά την χρονομεταβαλλόμενη συμπιεστή εκβολή ρευστού Carreau ...
    • Article  

      Numerical study of the combined effects of inertia, slip, and compressibility in extrusion of yield stress fluids 

      Kountouriotis, Zacharias; Georgiou, Georgios C.; Mitsoulis, Evan C. (2014)
      The axisymmetric extrudate swell flow of a compressible Herschel–Bulkley fluid with wall slip is solved numerically. The Papanastasiou-regularized version of the constitutive equation is employed, together with a linear ...
    • Doctoral Thesis  Open Access

      On poiseuille flows of yield stress fluids with wall slip 

      Damianou, Yiolanda G. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2015-05)
      Τα ιξωδοπλαστικά υλικά συμπεριφέρονται σαν ρευστά ή σαν στερεά αν η τάση είναι μικρότερη ή μεγαλύτερη από την τάση διαρροής (yield stress), αντίστοιχα. Ο προσδιορισμός των περιοχών διαρροής και μη διαρροής, που δεν είναι ...
    • Article  

      On the combined effects of slip, compressibility, and inertia on the Newtonian extrudate-swell flow problem 

      Kountouriotis, Zacharias; Georgiou, Georgios C.; Mitsoulis, Evan C. (2013)
      We solve both the planar and axisymmetric extrudate-swell flows of a compressible Newtonian liquid with Navier slip at the wall, using the finite-element method in space and a fully-implicit finite-difference scheme in ...
    • Article  

      Perturbation solution of Poiseuille flow of a weakly compressible Oldroyd-B fluid 

      Housiadas, Kostas D.; Georgiou, Georgios C. (2011)
      The isothermal, planar Poiseuille flow of a weakly compressible Oldroyd-B fluid is considered under the assumption that the density of the fluid obeys a linear equation of state. A perturbation analysis for all the primary ...
    • Article  

      Perturbation solution of the compressible annular Poiseuille flow of a viscous fluid 

      Joseph, S.; Joseph, L.; Georgiou, Georgios C. (2010)
      The isothermal annular Poiseuille flow of a weakly compressible Newtonian liquid with constant shear and bulk viscosities is considered. A linear equation of state is assumed and a perturbation analysis in terms of the ...
    • Article  

      Perturbation solutions of Poiseuille flows of weakly compressible Newtonian liquids 

      Taliadorou, Eleni G.; Neophytou, Marios; Georgiou, Georgios C. (2009)
      Both the planar and axisymmetric isothermal Poiseuille flows of weakly compressible Newtonian liquids with constant shear and bulk viscosities are solved up to the second-order. A linear equation of state is assumed and a ...
    • Article  

      Perturbation solutions of weakly compressible Newtonian Poiseuille flows with Navier slip at the wall 

      Poyiadji, Stella; Georgiou, Georgios C.; Kaouri, Katerina; Housiadas, Kostas D. (2012)
      We consider both the planar and axisymmetric steady, laminar Poiseuille flows of a weakly compressible Newtonian fluid assuming that slip occurs along the wall following Navier's slip equation and that the density obeys a ...
    • Doctoral Thesis  Open AccessOpen Access

      Perturbation solutions of weakly compressible Newtonian Poiseuille flows with pressure-dependent viscosity 

      Poyiadji, Stella V. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2012-05)
      Στη διατριβή αυτή θεωρούμε Νευτώνειες ροές Poiseuille όπου η πυκνότητα ή/και το ιξώδες είναι συναρτήσεις της πίεσης. Όπου είναι δυνατόν, βρίσκουμε ακριβείς λύσεις ή προσεγγιστικές λύσεις μέσω ασυμπτωτικών αναπτυγμάτων τα ...
    • Article  

      Stable finite element solutions of fully viscous compressible flows 

      Barsoum, M. E.; Alexandrou, Andreas N. (1995)
      This paper presents a stable approach to solve convection-dominated flows in the presence of compressibility effects. This approach employs the Petrov-Galerkin weighing to the FEM equations to achieve stability at the high ...
    • Article  

      A study of various factors affecting Newtonian extrudate swell 

      Mitsoulis, Evan C.; Georgiou, Georgios C.; Kountouriotis, Zacharias (2012)
      Finite-element simulations have been undertaken for the benchmark problem of extrudate swell present in extrusion. Both cases of planar and axisymmetric domains were considered under laminar, isothermal, steady-state ...
    • Article  

      Time-dependent compressible extrudate-swell problem with slip at the wall 

      Georgiou, Georgios C. (1994)
      We solve the time-dependent compressible Newtonian extrudate-swell problem with slip at the wall, in an attempt to simulate the stick-slip extrusion instability. An arbitrary nonlinear slip model relating the shear stress ...
    • Article  

      The time-independent, compressible Poiseuille and extrudate-swell flows of a Carreau fluid with slip at the wall 

      Georgiou, Georgios C. (2003)
      We solve the time-dependent, compressible Poiseuille and extrudate-swell flows of a shear-thinning fluid that obeys the Carreau constitutive model, using finite elements in space and a fully-implicit scheme in time. Slip ...
    • Article  

      A two-dimensional numerical study of the stick-slip extrusion instability 

      Taliadorou, Eleni G.; Georgiou, Georgios C.; Alexandrou, Andreas N. (2007)
      The time-dependent, compressible extrusion of a Carreau fluid is solved over the reservoir-die-extrudate region using finite elements in space and a fully implicit scheme in time. A nonmonotonic slip law based on experimental ...
    • Article  

      A two-dimensional numerical study of the stick-slip extrusion instability 

      Taliadorou, E.; Georgiou, G. C.; Alexandrou, Andreas N. (2007)
      The time-dependent, compressible extrusion of a Carreau fluid is solved over the reservoir-die-extrudate region using finite elements in space and a fully implicit scheme in time. A nonmonotonic slip law based on experimental ...